Waveguide communication with increased link data rate

ABSTRACT

Embodiments of the present disclosure may relate to a transceiver to transmit and receive concurrently radio frequency (RF) signals via a dielectric waveguide. In embodiments, the transceiver may include a transmitter to transmit to a paired transceiver a channelized radio frequency (RF) transmit signal via the dielectric waveguide. A receiver may receive from the paired transceiver a channelized RF receive signal via the dielectric waveguide. In embodiments, the channelized RF receive signal may include an echo of the channelized RF transmit signal. The transceiver may further include an echo suppression circuit to suppress from the channelized RF receive signal the echo of the channelized RF transmit signal. In some embodiments, the channelized RF transmit signal and the channelized RF receive signal may be within a frequency range of approximately 30 gigahertz (GHz) to approximately 1 terahertz (THz), and the transceiver may provide full-duplex millimeter-wave communication.

FIELD

Embodiments of the present disclosure generally relate to the field ofcommunication over dielectric waveguides and, more particularly, towaveguide communication with increased link data rate.

BACKGROUND

As increasing numbers of devices become interconnected and users consumemore data, the demand on servers to provide that data may continue togrow. These demands may include, for example, increased data rates,switching architectures with longer interconnects, reduced cost, andpower competitive solutions.

For medium range transmission in servers and high performance computers,dielectric waveguides operating millimeter-scale electromagneticwavelengths, sometimes referred to as a millimeter-wave (mm-wave)frequency range, may provide a performance and/or cost advantage withrespect to optical and/or electrical fabrics. As used herein, “mediumrange” may refer to transmission ranges of approximately 1 toapproximately 5 meters (m). The desired data rate at a mm-wave frequencyrange may be achieved by taking advantage of available frequencybandwidth. For example, a radio or transceiver operating over a 40Gigahertz (GHz) bandwidth from 100 GHz to 140 GHz may deliver data ratesof approximately 40 Gigabits per second (Gbps) with a quadrature phaseshift keying (QPSK) modulation scheme. The same radio may deliver up to80 Gbps over the same frequency range if a quadrature amplitudemodulation 16 (QAM16) modulation scheme is used.

In some radio-over-waveguide applications, point-to-point communicationbetween two connected devices may be directed in both directions. Suchcommunications may operate as emulated full-duplex systems over ahalf-duplex channel and employ time-division multiplexing (TDM) orfrequency-division multiplexing (FDM), for example.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments will be readily understood by the following detaileddescription in conjunction with the accompanying drawings. To facilitatethis description, like reference numerals designate like structuralelements. Embodiments are illustrated by way of example and not by wayof limitation in the figures of the accompanying drawings.

FIG. 1 depicts a block diagram of a system with transceivers to transmitand receive channelized signals over a dielectric waveguide, inaccordance with various embodiments.

FIG. 2 depicts a block diagram of a transceiver to transmit and receivechannelized signals over a dielectric waveguide, in accordance withvarious embodiments.

FIG. 3 is a block diagram of a transmitter to transmit channelizedsignals over a dielectric waveguide, in accordance with variousembodiments.

FIG. 4 is a block diagram of a receiver to receive channelized signalsfrom a dielectric waveguide, in accordance with various embodiments.

FIG. 5 is a flow diagram of a technique of radio frequency communicationover a dielectric waveguide with echo suppression, in accordance withvarious embodiments.

FIG. 6 depicts a block diagram of a transceiver to transmit and receivechannelized signals over a dielectric waveguide with frequencysplitting, in accordance with various embodiments

FIG. 7 is a block diagram of an example computing device, in accordancewith various embodiments.

FIG. 8 illustrates an example storage medium with instructionsconfigured to enable an apparatus to practice various aspects of thepresent disclosure, in accordance with various embodiments.

DETAILED DESCRIPTION

Embodiments of the present disclosure may relate to a transceiver totransmit and receive concurrently radio frequency (RF) signals via adielectric waveguide. In embodiments, the transceiver may include atransmitter to transmit to a paired transceiver a channelized radiofrequency (RF) transmit signal via the dielectric waveguide. A receivermay receive from the paired transceiver a channelized RF receive signalvia the dielectric waveguide. A circulator may be coupled between thetransmitter, the receiver, and the dielectric waveguide to deliver thechannelized RF transmit signal from the transmitter to the dielectricwaveguide and to concurrently deliver the channelized RF receive signalfrom the dielectric waveguide to the receiver. In embodiments, thechannelized RF receive signal delivered from the circulator may includean echo of the channelized RF transmit signal from the transceiver. Thetransceiver may further include an echo suppression circuit to suppressfrom the channelized RF receive signal the echo of the channelized RFtransmit signal. In some embodiments, the channelized RF transmit signaland the channelized RF receive signal each has a frequency range from alower frequency greater than or equal to approximately 30 gigahertz(GHz) to an upper frequency less than approximately 1 terahertz (THz),and the transceiver may provide full-duplex millimeter-wavecommunication.

In the following description, various aspects of the illustrativeimplementations will be described using terms commonly employed by thoseskilled in the art to convey the substance of their work to othersskilled in the art. However, it will be apparent to those skilled in theart that embodiments of the present disclosure may be practiced withonly some of the described aspects. For purposes of explanation,specific numbers, materials, and configurations are set forth in orderto provide a thorough understanding of the illustrative implementations.It will be apparent to one skilled in the art that embodiments of thepresent disclosure may be practiced without the specific details. Inother instances, well-known features are omitted or simplified in ordernot to obscure the illustrative implementations.

In the following detailed description, reference is made to theaccompanying drawings that form a part hereof, wherein like numeralsdesignate like parts throughout, and in which is shown by way ofillustration embodiments in which the subject matter of the presentdisclosure may be practiced. It is to be understood that otherembodiments may be utilized and structural or logical changes may bemade without departing from the scope of the present disclosure.Therefore, the following detailed description is not to be taken in alimiting sense, and the scope of embodiments is defined by the appendedclaims and their equivalents.

For the purposes of the present disclosure, the phrase “A and/or B”means (A), (B), or (A and B). For the purposes of the presentdisclosure, the phrase “A, B, and/or C” means (A), (B), (C), (A and B),(A and C), (B and C), or (A, B, and C).

The description may use perspective-based descriptions such astop/bottom, in/out, over/under, and the like. Such descriptions aremerely used to facilitate the discussion and are not intended torestrict the application of embodiments described herein to anyparticular orientation.

The description may use the phrases “in an embodiment,” or “inembodiments,” which may each refer to one or more of the same ordifferent embodiments. Furthermore, the terms “comprising,” “including,”“having,” and the like, as used with respect to embodiments of thepresent disclosure, are synonymous.

The term “coupled with,” along with its derivatives, may be used herein.“Coupled” may mean one or more of the following. “Coupled” may mean thattwo or more elements are in direct physical or electrical contact.However, “coupled” may also mean that two or more elements indirectlycontact each other, but yet still cooperate or interact with each other,and may mean that one or more other elements are coupled or connectedbetween the elements that are said to be coupled with each other. Theterm “directly coupled” may mean that two or more elements are in directcontact.

In various embodiments, the phrase “a first layer formed, deposited, orotherwise disposed on a second layer” may mean that the first layer isformed, deposited, grown, bonded, or otherwise disposed over the secondlayer, and at least a part of the first layer may be in direct contact(e.g., direct physical and/or electrical contact) or indirect contact(e.g., having one or more other layers between the first layer and thesecond layer) with at least a part of the second layer.

As used herein, the term “module” may refer to, be part of, or includean Application Specific Integrated Circuit (ASIC), an electroniccircuit, a processor (shared, dedicated, or group), and/or memory(shared, dedicated, or group) that execute one or more software orfirmware programs, a combinational logic circuit, and/or other suitablecomponents that provide the described functionality.

FIG. 1 depicts a system 100 having a first electronic device 102 and asecond electronic device 104 that may include a first transceiver 106and a second transceiver 108, respectively, to transmit and receivechannelized signals over a dielectric waveguide 110, in accordance withvarious embodiments. In some embodiments, the dielectric waveguide 110may be referred to as a “channel”. However, it should be understood thata physical waveguide channel is different than the frequency channelsused for channelized signal transmission over the dielectric waveguide110. In some embodiments, the first electronic device 102 may include afirst processor 112 coupled with the first transceiver 106 and thesecond electronic device 104 may include a second processor 114 coupledwith the second transceiver 108. In various embodiments, the firstelectronic device 102 and/or the second electronic device 104 may be acomputing device such as a blade server in a data center, a networkingdevice such as a switch or router, or some other electronic device thattransmits and/or receives data.

In some embodiments, the first transceiver 106 may include a firsttransmitter 116 and a first receiver 118. In various embodiments, thefirst transmitter 116 may be configured to receive one or more datasignals from a data source such as the first processor 112. In someembodiments, the first transmitter 116 may generate a channelized signalhaving two or more frequency channels that may be in distinctnon-overlapping frequency bands and may modulate a signal to betransmitted in each channel based at least in part on the received oneor more data signals. As shown, a transmitted signal may include threefrequency channels, with the first channel having a first centerfrequency, f₁, the second channel having a second center frequency, f₂,and the third channel having a third center frequency, f₃. Althoughthree frequency channels are shown, a different number of channels maybe used in other embodiments. In various embodiments, the first receiver118 may be configured to receive a channelized signal over thedielectric waveguide 110 and demodulate the channelized signal torecover data that may then be provided to another component such as theprocessor 112.

In some embodiments, the first transceiver 106 may include a firstwaveguide interface 119 coupled with the first transmitter 116 and thefirst receiver 118. In various embodiments, the first waveguideinterface 119 may be configured to allow the first transmitter 116 andthe first receiver 118 to simultaneously or concurrently transmit andreceive over the waveguide 110. Similarly, the second transceiver 108may include a second transmitter 120 and a second receiver 122 that mayoperate in similar fashion to that described with respect to the firsttransmitter 116 and the first receiver 118, respectively. In variousembodiments, the first transceiver 106 may communicate with the secondtransceiver 108 over a single dielectric waveguide 110 and may be ableto simultaneously receive and transmit over the dielectric waveguide 110on multiple frequency channels.

In some embodiments, the second transceiver 108 may include a secondwaveguide interface 123 coupled with the second transmitter 120 and thesecond receiver 122. In various embodiments, the second waveguideinterface 123 may be configured to allow the second transmitter 120 andthe second receiver 122 to simultaneously transmit and receive over thewaveguide 110. In various embodiments, the first transceiver 106 and thesecond transceiver 108 may communicate over the dielectric waveguide 110in a radio frequency (RF) frequency range that may be, for example,between approximately 30 GHz and approximately 300 GHz. In someembodiments, this RF frequency range may be described as a millimeter(mm)-wave frequency range. In various embodiments, the RF frequencyrange used for communication over the dielectric waveguide may extendupwards beyond 300 GHz into the sub-terahertz (THz) range to belowapproximately 1 THz.

The dielectric waveguide 110 may include a plurality of differentdielectric layers with different refractive indices. For example, thedielectric waveguide 110 may be composed of three different dielectriclayers. The refractive indices of the layers of the dielectric waveguide110 may be selected such that the RF signal transmitted through thedielectric waveguide 110 may generally reflect within, and propagatethrough, the dielectric waveguide 110 without incurring significantsignal loss. In some embodiments, the dielectric waveguide 110 may be ametal coated dielectric waveguide.

In embodiments, the example system 100 may be an element of a server.For example, the first electronic device 102 may be an element of onerack of a server, and the second electronic device 104 may be an elementof another rack of the server. In other embodiments, the firsttransceiver 106 may be an element of one server, and the secondtransceiver 108 may be an element of another server. These are intendedonly as example configurations, and in other configurations the firsttransceiver 106 and/or the second transceiver 108 may be elements ofsome other type of server, computing device, mobile device, laptop,desktop, data center, or some other electronic device. In someembodiments, the dielectric waveguide 110 may have a length of betweenapproximately 1 meter (m) and 5 m, but may have a different length inother embodiments. In various embodiments, the first processor 112 andthe first transceiver 106 may be included on a common substrate of thefirst electronic device 102 and/or the second processor 114 and thesecond transceiver 108 may be included on a common substrate of thesecond electronic device 104.

FIG. 2 is a block diagram of a transceiver 200 that, according to someembodiments, may include a transmitter 300 to modulate and transmit datasignal inputs as a plurality of channelized transmit signals and areceiver 400 to receive and demodulate a plurality of channelizedreceive signals. In some embodiments, the transceiver 200 may be animplementation of the first transceiver 106 and/or the secondtransceiver 108 described with respect to FIG. 1, the transmitter 300may be an implementation of the first transmitter 116 and/or the secondtransmitter 120 described with respect to FIG. 1, and the receiver 400may be an implementation of the first receiver 118 and/or the secondreceiver 122 described with respect to FIG. 1. Embodiments of thetransmitter 300 and the receiver 400 are described in greater detailbelow with reference to FIGS. 3 and 4, respectively.

In some embodiments, transceiver 200 may further include a waveguideinterface 210, which may be an implementation of the first waveguideinterface 119 and/or the second waveguide interface 123 described withrespect to FIG. 1. Waveguide interface 210 may include a circulator 220and a dielectric waveguide connector 230 for connecting transceiver 200with a dielectric waveguide 240. Circulator 220 may include a port 221coupled to transmitter 300, a port 222 coupled to waveguide 240 viaconnector 230, and a port 223 to communicate with receiver 400.Transmitter 300 may deliver a transmit signal to waveguide 240 viacirculator 220 for transmission to a paired transceiver 201. Receiver400 may receive a receive signal from waveguide 240 via circulator 220,as a transmission from the paired transceiver 201. In embodiments,paired transceiver 201 may be an implementation of transceiver 200.

Waveguide interface 210 may allow transmitter 300 and receiver 400 to,respectively, transmit and receive over waveguide 240 simultaneouslyand/or concurrently. In embodiments, circulator 210 may be configuredand/or operate as a hard-wired router, in that the transmit signal fromthe transmitter 300 may be delivered to the waveguide 240, and thereceive signal from the waveguide 240 may be directed toward thereceiver 400 simultaneously. As a result, transceiver 200 may operate infull-duplex, which may provide increased (e.g., doubled) data rates orbandwidth over communication systems that may employ emulatedfull-duplex communication over a half-duplex channel using time-divisionmultiplexing (TDM) or frequency-division multiplexing (FDM). In additionto increased data rates or bandwidth, full-duplex operation oftransceiver 200 may provide improved space efficiency (sometimesreferred to as bandwidth density) and decreased cost.

An aspect of such full-duplex operation of transceiver 200, however, maybe that the receive signal directed from circulator 220 toward receiver400 may include noise and/or distortion, which may be related to thetransmit signal from transmitter 300. In some embodiments, the noise ordistortion may include a concurrent echo of a transmit signal that maypass from transmitter 300 and through circulator 210 concurrently orsimultaneously as the receive signal passes circulator 220 towardreceiver 400. The concurrent echo may be imparted on or distort thereceive signal at circulator 220. Such noise or distortion of thereceive signal may arise in some embodiments because isolation betweenports 221 and 223 may be non-ideal (e.g., non-infinite) and/or thetransmit signal from transmitter 300 at port 221 may have a powergreater than a power of the receive signal at port 223 received fromwaveguide 220, resulting in the concurrent echo being imparted on thereceive signal.

In addition, noise or distortion imparted on the receive signal mayinclude a reflected echo of the transmit signal transmitted fromtransmitter 300 at a previous time along waveguide 220 to pairedtransceiver 201, and reflected back to transceiver 200 along waveguide220 from the paired transceiver 201 and received by receiver 400 withthe receive signal. The reflected echo may include a delay correspondingto propagation of the transmit signal from transmitter 300 at theprevious time, along the waveguide 240, to the paired transceiver 201,and back as a reflected echo. The reflected echo may also includeamplitude attenuation related to propagating along waveguide 220 twotimes. For example, if the waveguide 220 has a 10 dB loss betweentransceiver 200 and the paired transceiver 201, the reflected echo mayhave an amplitude attenuation of 20 dB based on traveling waveguide 220from transceiver 200, to paired transceiver 201, and back. In contrast,the receive signal received by transceiver 200 from paired transceiver201 may have an amplitude attenuation of 10 dB based on a singletransmission from along waveguide 240 from paired transceiver 201. As aresult, the receive signal may be of a greater amplitude than thereflected echo.

In addition, the reflected echo may include chromatic dispersion inwhich the phase velocity of an electromagnetic wave in a dielectricwaveguide may depend on its frequency and may result in signals ofdifferent frequencies propagating at different speeds through a mediumsuch as the dielectric waveguide 220. For example, chromatic dispersionmay cause frequency channels at a higher frequency to experience lessdelay than signals at a lower frequency.

In embodiments, transceiver 200 and/or receiver 400 may include an echosuppression circuit 250, which may also be referred to as an echocancellation circuit, through which the receive signal received bycirculator 220 from waveguide 240 may be directed to receiver 400. Alsoin some embodiments, transceiver 200 and/or receiver 400 may include apreamplifier filter 260 that may condition the receive signal, asdescribed below. Echo suppression circuit 250 may provide suppressionand/or cancellation of noise and or distortion on the receive signal. Inembodiments, echo suppression circuit 250 may suppress or cancelconcurrent echo and/or reflected echo that may distort the receivesignal. For example, echo suppression circuit 250 may subtract from thereceive signal a representation of the transmit signal from transmitter300 corresponding to the concurrent echo and/or the reflected echo. Therepresentation of the transmit signal corresponding to the concurrentecho and/or the reflected echo may include delay and appropriatefiltering will be determined by the type and length of the waveguide. Itmay therefore be desirable for this delay and filter to be adjustable orprogrammable to accommodate different channels.

With regard to concurrent echo suppression, echo suppression circuit 250may include an input 270 to receive from transmitter 300 the transmitsignal that corresponds to the concurrent echo. In embodiments, echosuppression circuit 250 may generate a concurrent echo suppressionsignal that corresponds to an attenuated version of the transmit signal,and may include a time delay corresponding to the time for theconcurrent echo to pass through circulator 220 and preamplifier filter260. Echo suppression circuit 250 may suppress and/or cancel theconcurrent echo by subtracting the concurrent echo suppression signalfrom the receive signal.

In some embodiments, for example, subtracting the concurrent echosuppression signal from the receive signal may include summing aninverse of the concurrent echo suppression signal with the receivesignal. In some other embodiments, isolation response of circulator 220may not be uniform in amplitude or phase across an entire frequencyband. In such embodiments, preamplifier filter 260 may be included withan inverse response to offset nonuniform isolation response ofcirculator 220 in amplitude or phase. Chromatic dispersion of theconcurrent echo may be negligible.

With regard to reflected echo suppression, echo suppression circuit 250may generate a reflected echo suppression signal and may suppress and/orcancel the reflected echo by subtracting the reflected echo suppressionsignal from the receive signal. The reflected echo suppression signalmay be generated with accommodation for chromatic dispersion of thereflected echo, with respect to its original transmit signal, and thetime delay for the reflected echo to travel the length of waveguide 240and back.

Transceiver 200 and/or receiver 400 may include a waveguide channelcalibration circuit 285 that may communicate and cooperate with echosuppression circuit 250 to generate the reflected echo suppressionsignal with accommodation for chromatic dispersion of the reflected echoand the time delay for the reflected echo to travel the length ofwaveguide 240 and back. In embodiments, calibration circuit 285 may beadjustable or programmable to adapt or calibrate the reflected echosuppression signal according known characteristics of waveguide 240including its chromatic dispersion and/or its length, for example, or toaccommodate different channels. The reflected echo suppression signalmay also be based on a transmit signal received from transmitter 300 atinput 270, but with a time offset to accommodate the time delay for thereflected echo to travel the length of waveguide 240 and back, and withaccommodation for chromatic dispersion provided by calibration circuit285. In embodiments, echo suppression circuit 250 may generate thereflected echo suppression signal with a decreased amplitude toaccommodate attenuation of the reflected echo due to traveling thelength of waveguide 240 twice.

FIG. 3 is a block diagram of a transmitter 300 to modulate data signalinputs onto a plurality of channelized signals, in accordance withvarious embodiments. In some embodiments, the transmitter 300 may be animplementation of the first transmitter 116 and/or the secondtransmitter 120 described with respect to FIG. 1. In variousembodiments, the transmitter 300 may include n data signal inputs suchas inputs 301, 302, 30 n, etc. It should be understood that n inputsrepresents a general number of inputs, where various embodiments mayhave differing numbers of data signal inputs. In some embodiments, thesignals may be received from an electronic device to which thetransmitter 300 is physically, electronically, and/or communicativelycoupled (e.g., first processor 112 or second processor 114). In variousembodiments, the transmitter 300 may share the same housing as theelectronic device, or be separate from the electronic device butcommunicatively coupled to the electronic device by the data signalinputs 301/302/30 n.

In various embodiments, the transmitter 300 may include a plurality ofcomponents, such as amplifiers 311, 312, 31 n, etc., each of which mayreceive one of the data signal inputs 301/302/30 n to generate anamplified signal. In some embodiments, the transmitter 300 may include aplurality of mixers 321, 322, 32 n, each of which may have a localoscillator signal input 331, 332, 33 n, respectively to receive a signalfrom a local oscillator synthesizer. In various embodiments, thetransmitter 300 may include a local oscillator synthesizer 340 togenerate a plurality of local oscillator signals 341, 342, 34 n, etc.that may be used as inputs to the local oscillator signal inputs 331,332, 33 n, respectively. In some embodiments, the mixers 321/322/32 nmay upconvert the incoming amplified data signals based at least in parton the local oscillator signals 341/342/34 n. In various embodiments,the mixers 321/322/32 n may include additional inputs (not shown forclarity) and/or may also be modulators that may modulate the upconvertedRF signal with a modulation scheme such as binary phase-shift keying(BPSK), quadrature phase-shift keying (QPSK), 8 phase-shift keying(8-PSK), a pulse amplitude modulation (PAM) scheme (e.g., PAM4), aquadrature amplitude modulation (QAM) scheme (e.g., QAM16), or any othersuitable modulation scheme.

In some embodiments, the transmitter 300 may include a combiner 350 thatmay receive the upconverted, modulated RF signals from the mixers321/322/32 n as inputs and combine the RF signals to produce achannelized output RF signal at an output 352 that may be coupled withthe waveguide 110 for transmission of the channelized RF signal toanother device. In various embodiments, some other component such as amultiplexer may be used in addition to, or in place of, the combiner350. In some embodiments, the transmitter 300 may use a frequencydivision multiple access (FDMA) approach.

In various embodiments, the LO oscillator signals 341/342/34 n output bythe LO synthesizer 340 may be fixed frequencies used by the mixers321/322/32 n to upconvert the incoming signals from the amplifiers311/312/31 n to have the center frequencies f₁, f₂, f₃ shown in FIG. 1or the center frequencies f₁, f₂, f_(N) shown in FIG. 2. In someembodiments, the LO synthesizer 340 may be programmable such that the LOoscillator signals 341/342/34 n may be changed in frequency and/ornumber. In embodiments, the LO synthesizer 340 may be programmable basedat least in part on switching one or more capacitor banks on and/or offin response to one or more control signals.

In various embodiments, the transmitter 300 may include logic circuitry360 coupled with the LO synthesizer 340 to direct the LO synthesizer 340to generate the LO oscillator signals 341/342/34 n based at least inpart on a signal received at a LO control input 362. In someembodiments, the LO control input 362 may be a serial peripheralinterface (SPI) bus coupled with a microcontroller (not shown forclarity) that may be included in the first electronic device 102 or thesecond electronic device 104. In other embodiments, the logic circuitry360 may receive a signal at the LO control input 362 from the firstprocessor 112 or the second processor 114. In some embodiments, the LOcontrol input 362 may not be present and the logic circuitry 360 maydirect the LO synthesizer 340 based on circuitry and/or modules withinthe logic circuitry 360 without using control signals from an externalinput such as the LO control input 362. In various embodiments, thelogic circuitry 360 may be or include a controller to direct the LOsynthesizer 340 to generate a number of frequencies based at least inpart on a total group delay over an available frequency bandwidth. Insome embodiments, the number of channels for modulated RF signaltransmission may be equal to the number of frequencies generated by theLO synthesizer 340.

It should be understood that the transmitter 300 is intended as anexample and other configurations may be possible. For example,additional components such as filters, processors, etc. may be presentin transmitter 300. In some embodiments, there may be more or feweramplifiers than shown in FIG. 3. For example, in some embodiments asingle amplifier may be shared among multiple signal lines, or a singlesignal line may be coupled with a plurality of amplifiers. In someembodiments a signal line may not include an amplifier. As used herein,a “signal line” with respect to the transmitter 300 may refer to theabove-described transmission path of data received on an input such asinput 301, 302, 30 n, etc. Similarly, there may be more or fewer mixersthan shown in FIG. 3. In some embodiments, the arrangement of theelements may be different than shown, for example, one or more mixers321/322/32 n may precede an amplifier 311/312/31 n in a signal line. Inembodiments, one or more of the described amplification, mixing,modulation, upconversion, combining, etc. may be performed by one ormore circuitry, modules, logic, firmware, software, and/or hardware.

In embodiments, the frequency channelization may be selected orconfigured based on a characteristic of the dielectric waveguide 110.For example, the number and/or center frequencies of the LO signalsgenerated by the LO synthesizer 340 may be preconfigured based on aknown channel response or channel characteristic of the dielectricwaveguide 110 such as the total dispersion over an available bandwidth.In other embodiments, the transmitter 300 may be configured todynamically and/or periodically test the dielectric waveguide 110 toidentify a characteristic of the dielectric waveguide 110 on which tobase the frequency channelization parameters.

In various embodiments, the transmitter 300 may also include additionalcomponents such as one or more dispersion compensators, equalizationcircuits, pre-distortion circuits, digital trimming circuits, pulseshaping circuits, and/or other types of signal processing circuits notshown for clarity. Although some components, such as the logic circuitry360 may be referred to as circuitry, it should be understood that thecomponents of the transmitter 300 may be performed by one or moremodules, logic, firmware, software, and/or hardware.

FIG. 4 depicts a block diagram of a receiver 400, in accordance withvarious embodiments. In some embodiments, the receiver 400 may be animplementation of the first receiver 118 and/or the second receiver 122described with respect to FIG. 1. In various embodiments, the receiver400 may include an input 402 to be coupled with the dielectric waveguide110. In some embodiments, the input 402 may receive, from the dielectricwaveguide 110, a channelized, modulated, RF signal such as may betransmitted by the transmitter 300. In various embodiments, the receiver400 may include a splitter 404 coupled with the input 402. In someembodiments, the splitter 404 may be a demultiplexer. In variousembodiments, the splitter 404 may be configured to split a channelizedRF signal from the input 402 into a plurality of RF signals on ndifferent signal lines. In some embodiments, the number of signal linesgenerated by the splitter 404 may be the same as the number of signallines propagating through the transmitter 300. Similarly to the use ofthe term with respect to the transmitter 300, the term “signal line” mayrefer to the transmission path of data through the receiver 400. Morespecifically, receiver 400 is shown as having n different signal lines.

In some embodiments, the receiver 400 may include a plurality of filters411, 412, 41 n, etc., each of which may receive one of the signal linesfrom the splitter 404 as an input. In some embodiments, the filters411/412/41 n may be band pass filters, each of which may be configuredto pass RF signals in a predetermined frequency range. In otherembodiments, one or more of the filters 411/412/41 n may be programmablefilters that may have a configurable frequency pass band or range thatmay be altered based at least in part on a filter control signal at afilter control signal input (not shown for clarity). In variousembodiments, the receiver 400 may include other components, such asamplifiers 421, 422, 42 n to amplify signals from the filters 411/412/41n. In some embodiments, the receiver may include a plurality ofdemodulators 431, 432, 43 n, etc. to demodulate and downconvert signalsfrom the amplifiers 421/422/42 n based at least in part on a signalreceived at a local oscillator input 441/442/44 n, respectively. Invarious embodiments, one or more of the demodulators 431/432/43 n mayinclude or be a mixer.

In some embodiments, the receiver 400 may include a local oscillatorsynthesizer 450 to generate a plurality of local oscillator signals 451,452, 45 n, etc. that may be used as inputs to the local oscillatorinputs 441, 442, 44 n, respectively. In some embodiments, thedemodulators 431/432/43 n may downconvert the amplified signals based atleast in part on the local oscillator signals 451/452/45 n anddemodulate the signals to generate output signals 461, 462, 46 n, etc.that may be provided to another component such as the first processor112 or the second processor 114. In various embodiments, thedemodulators 431/432/43 n may include additional inputs and/or outputs(not shown for clarity). In various embodiments, the LO oscillatorsignals 451/452/45 n output by the LO synthesizer 450 may be fixedfrequencies used by the demodulators 431/432/43 n to downconvert theincoming signals from the amplifiers 421/422/42 n and/or the filters411/412/41 n. In some embodiments, the LO synthesizer 450 may beprogrammable such that the LO oscillator signals 451/452/45 n may bechanged in frequency and/or number. In embodiments, the LO synthesizer450 and/or the filters 411/412/41 n may be programmable based at leastin part on switching one or more capacitor banks on and/or off inresponse to one or more control signals.

In various embodiments, the receiver 400 may include logic circuitry 470coupled with the LO synthesizer 450 to direct the LO synthesizer 450 togenerate the LO oscillator signals 451/452/45 n based at least in parton a signal received at a LO control input 472. In some embodiments, thefilters 411/412/41 n may be programmable, with filtering characteristicssuch as a pass band based at least in part on a filter control signalgenerated by the logic circuitry 470. In various embodiments, the logiccircuitry 470 may provide control signals to both the filters 411/412/41n and the LO synthesizer 450. In some embodiments, the LO control input472 may be a SPI bus coupled with a microcontroller (not shown forclarity) that may be included in the first electronic device 102 or thesecond electronic device 104. In other embodiments, the logic circuitry470 may receive a signal at the LO control input 472 from the firstprocessor 112 or the second processor 114. In some embodiments, the LOcontrol input 472 may not be present and the logic circuitry 470 maydirect the LO synthesizer based on circuitry and/or modules within thelogic circuitry 470 without using control signals from an external inputsuch as the LO control input 472. In various embodiments, the logiccircuitry 470 may be or include a controller coupled with the filters411/412/41 n to direct respective ones of the filters 411/412/41 n toallow RF signals in a channel frequency range having a lower frequencyand an upper frequency specified by the controller to pass through thefilters 411/412/41 n.

In some embodiments, the logic circuitry 470 may not be present and/orthe LO synthesizer 450 and/or the filters 411/412/41 n may receivecontrol signals from logic circuitry located outside of the receiver400. In some embodiments, the logic circuitry 470 and the logiccircuitry 360 may be in a common location and/or may receive controlsignals from a common component. In embodiments, a single LO synthesizermay be used for both the LO synthesizer 340 and the LO synthesizer 450.

It should be understood that the receiver 400 is intended as an exampleand other configurations may be possible. For example, additionalcomponents such as filters, processors, etc. may be present in receiver400. In some embodiments, there may be more or fewer filters oramplifiers than shown in FIG. 4. For example, in some embodiments asingle amplifier may be shared among multiple signal lines, or a singlesignal line may be coupled with a plurality of amplifiers. In someembodiments a signal line may not include an amplifier. As used hereinwith respect to the receiver 400, a “signal line” may refer to theabove-described reception path of a signal from the splitter 404 that isconverted to output data signals at the outputs 461/462/46 n. Similarly,there may be more or fewer demodulators than shown in FIG. 4. In someembodiments, the arrangement of the elements may be different thanshown, for example, one or more demodulators 431/432/43 n may precede anamplifier 431/432/43 n in a signal line. In some embodiments, thereceiver 400 may include a clock and data recovery (CDR) circuit 480 andmay be configured to use the CDR circuit 480 in conjunction with thedemodulators 431/432/43 n to generate the output data signals at theoutputs 461/462/46 n. In embodiments, one or more of the describedfiltering, amplifying, demodulation, downconversion, etc. may beperformed by one or more circuitry, modules, logic, firmware, software,and/or hardware.

In embodiments, the filter characteristics and/or the LO signals may beselected or configured based on a characteristic of the dielectricwaveguide 110. In some embodiments, the filter characteristics and/orthe LO signals may be selected or configured based at least in part on asignal from a transmitter such as the transmitter 300 indicating achannelization scheme used by the transmitter. In some embodiments, atransmission protocol may include a header indicating channelizationscheme parameters. In various embodiments, the logic circuitry 470 mayadjust one or more of the LO synthesizer 450 or one or more of thefilters 411/412/41 n based at least in part on the channelization schemeparameters received in the header from a transmitter such as thetransmitter 300.

In various embodiments, the receiver 400 may also include additionalcomponents such as one or more dispersion compensators, equalizationcircuits, digital trimming circuits, pulse shaping circuits, and/orother types of signal processing circuits not shown for clarity.Although some components, such as the logic circuitry 470 may bereferred to as circuitry, it should be understood that the components ofthe receiver 400 may be performed by one or more modules, logic,firmware, software, and/or hardware.

In various embodiments, the above described system 100, transmitter 300,and/or receiver 400 may present advantages to systems that usedielectric waveguides 110 in the 1 m to 5 m range to convey signals inthe mm-wave range and/or sub-THz range. For example, the above-describedarchitecture may help to achieve higher data rates than systems that donot channelize transmission signals to compensate for chromaticdispersion. Additionally, the use of a dielectric waveguide and/or atransceiver implementation that may use complementary metal oxidesemiconductor (CMOS) technology for transmission of signals in themm-wave and/or sub-THz range may present a cost advantage in comparisonto optical interconnects and transceivers. In some embodiments,channelizing signals may also allow dispersion compensators with lowerpower requirements to be used than would be possible with a widebandtransmission approach.

FIG. 5 is a flow diagram of a technique 500 of radio frequencycommunication over a dielectric waveguide with echo suppression.Technique 500 may provide full-duplex communication in a mm-wavefrequency range, in accordance with various embodiments. In embodiments,some or all of the technique 500 may be practiced by components shownand/or described with respect to the first electronic device 102 or thesecond electronic device 104 of FIG. 1; the transceiver of FIG. 2; thetransmitter 300 of FIG. 3; the receiver 400 of FIG. 4; and/or thecomputing device 700 of FIG. 7.

In various embodiments, the technique 500 may include at a block 502transmitting a channelized radio frequency (RF) transmit signal via adielectric waveguide to a paired transceiver. In embodiments, thechannelized RF transmit signal may include a plurality of modulated RFtransmit signals, and each may be in a channel having a frequency bandthat does not overlap with the frequency band of another of themodulated RF transmit signals.

A block 504 may include receiving from the paired transceiver achannelized RF receive signal via the dielectric waveguide concurrentlywith the transmitting of block 502. According to some embodiments, thechannelized RF receive signal may include a plurality of modulated RFreceive signals, and each may be in a channel having a frequency bandthat does not overlap with the frequency band of another of themodulated RF receive signals. In embodiments, the receive signal mayinclude first and second echoes of the transmit signal, wherein thefirst echo may include a concurrent echo of the transmit signalconcurrent with receiving the receive signal and the second echo mayinclude a reflected echo reflected from the paired transceiver.

A block 506 may include suppressing a concurrent echo from the receivesignal, and a block 508 may include suppressing a reflected echo fromthe receive signal.

FIG. 6 is a block diagram of a transceiver 600 that, according to someembodiments, may include components illustrated and described inconnection with FIGS. 2, 3, and 4, wherein like components havecorresponding reference numerals. Transceiver 600 may further providefrequency splitting so that transmit and receive signals of first andsecond frequency ranges may be provided to and processed bycombiner/splitters 612 and 613, respectively. In embodiments, each ofcombiner/splitters 612 and 613 may provide combining and splittingoperations that may correspond to combining that may be provided bycombiner 350 (FIG. 3) and splitting that may be provided by splitter 404(FIG. 4). Combiner/splitter 611 may provide frequency-based splittingand combining with respect to and between combiner/splitters 612 and613. In embodiments, frequency splitting and combining of the receiveand transmit signals of the first and second frequency ranges may allowrespective equalization circuits 621 and 622 to be applied to thesignals of the respective first and second frequency ranges, which mayprovide improved equalization of the signals.

FIG. 7 illustrates a block diagram of an example computing device 700suitable for use with various components of FIGS. 1-4 and 6, and thetechnique 500 of FIG. 5, in accordance with various embodiments. Forexample, the computing device 700 may be, or may include or otherwise becoupled to, first electronic device 102, second electronic device 104,first transceiver 106, second transceiver 108, first transmitter 116,second transmitter 120, first receiver 118, second receiver 122, firstprocessor 112, second processor 114, transmitter 300, and/or receiver400. As shown, computing device 700 may include one or more processorsor processor cores 702 and system memory 704. For the purpose of thisapplication, including the claims, the terms “processor” and “processorcores” may be considered synonymous, unless the context clearly requiresotherwise. The processor 702 may include any type of processors, such asa central processing unit (CPU), a microprocessor, and the like. Theprocessor 702 may be implemented as an integrated circuit havingmulti-cores, e.g., a multi-core microprocessor. The computing device 700may include mass storage devices 706 (such as diskette, hard drive,volatile memory (e.g., dynamic random-access memory (DRAM), compact discread-only memory (CD-ROM), digital versatile disk (DVD), and so forth).In general, system memory 704 and/or mass storage devices 706 may betemporal and/or persistent storage of any type, including, but notlimited to, volatile and non-volatile memory, optical, magnetic, and/orsolid state mass storage, and so forth. Volatile memory may include, butis not limited to, static and/or dynamic random access memory.Non-volatile memory may include, but is not limited to, electricallyerasable programmable read-only memory, phase change memory, resistivememory, and so forth.

The computing device 700 may further include I/O devices 708 (such as adisplay (e.g., a touchscreen display), keyboard, cursor control, remotecontrol, gaming controller, image capture device, and so forth) andcommunication interfaces 710 (such as network interface cards, modems,infrared receivers, radio receivers (e.g., Bluetooth), and so forth).

The communication interfaces 710 may include communication chips (notshown) that may be configured to operate the device 700 in accordancewith a Global System for Mobile Communication (GSM), General PacketRadio Service (GPRS), Universal Mobile Telecommunications System (UMTS),High Speed Packet Access (HSPA), Evolved HSPA (E-HSPA), or Long-TermEvolution (LTE) network. The communication chips may also be configuredto operate in accordance with Enhanced Data for GSM Evolution (EDGE),GSM EDGE Radio Access Network (GERAN), Universal Terrestrial RadioAccess Network (UTRAN), or Evolved UTRAN (E-UTRAN). The communicationchips may be configured to operate in accordance with Code DivisionMultiple Access (CDMA), Time Division Multiple Access (TDMA), DigitalEnhanced Cordless Telecommunications (DECT), Evolution-Data Optimized(EV-DO), derivatives thereof, as well as any other wireless protocolsthat are designated as 3G, 4G, 5G, and beyond. The communicationinterfaces 710 may operate in accordance with other wireless protocolsin other embodiments. In some embodiments, the communication interfaces710 may be, may include, and/or may be coupled with inputs 301/302/30 nand/or outputs 401/402/40 n. In various embodiments, the communicationinterfaces 710 may include a transceiver 752. In some embodiments, thetransceiver 752 may be configured similarly to the first transceiver 106and/or the second transceiver 108 described with respect to FIG. 1. Insome embodiments, the transceiver 752 may be coupled with othercomponents of the computer device 700 and/or may not be included withinthe communication interfaces 710.

The above-described computing device 700 elements may be coupled to eachother via system bus 712, which may represent one or more buses. In thecase of multiple buses, they may be bridged by one or more bus bridges(not shown). Each of these elements may perform its conventionalfunctions known in the art. In particular, system memory 704 and massstorage devices 706 may be employed to store a working copy and apermanent copy of the programming instructions for the operation ofvarious components of computing device 700, including but not limited toan operating system of computing device 700 and/or one or moreapplications. The various elements may be implemented by assemblerinstructions supported by processor(s) 702 or high-level languages thatmay be compiled into such instructions.

The permanent copy of the programming instructions may be placed intomass storage devices 706 in the factory, or in the field through, forexample, a distribution medium (not shown), such as a compact disc (CD),or through communication interface 710 (from a distribution server (notshown)). That is, one or more distribution media having animplementation of the agent program may be employed to distribute theagent and to program various computing devices.

The number, capability, and/or capacity of the elements 708, 710, 712may vary, depending on whether computing device 700 is used as astationary computing device, such as a set-top box or desktop computer,or a mobile computing device, such as a tablet computing device, laptopcomputer, game console, or smartphone. Their constitutions are otherwiseknown, and accordingly will not be further described.

In embodiments, memory 704 may include computational logic 722configured to implement various firmware and/or software servicesassociated with operations of the computing device 700. For someembodiments, at least one of processors 702 may be packaged togetherwith computational logic 722 configured to practice aspects ofembodiments described herein to form a System in Package (SiP) or aSystem on Chip (SoC).

In various implementations, the computing device 700 may comprise one ormore components of a data center, a laptop, a netbook, a notebook, anultrabook, a smartphone, a tablet, a personal digital assistant (PDA),an ultra mobile PC, a mobile phone, or a digital camera. In furtherimplementations, the computing device 700 may be any other electronicdevice that processes data.

FIG. 8 illustrates example computer-readable storage medium 802 havinginstructions configured to practice all or selected ones of theoperations associated with the computer device 700, earlier describedwith respect to FIG. 7; the first electronic device 102, the secondelectronic device 104, including the first transceiver 106, the secondtransceiver 108, the first processor 112, and/or the second processor114 described with respect to FIG. 1; the transmitter 300, including thelogic circuitry 360 described with respect to FIG. 3; the receiver 400,including the logic circuitry 470 described with respect to FIG. 4;and/or the technique of FIG. 5, in accordance with various embodiments.As illustrated, computer-readable storage medium 802 may include anumber of programming instructions 804. The storage medium 802 mayrepresent a broad range of non-transitory persistent storage mediumknown in the art, including but not limited to flash memory, dynamicrandom access memory, static random access memory, an optical disk, amagnetic disk, etc. Programming instructions 804 may be configured toenable a device, e.g., computer device 700, first electronic device 102,and/or second electronic device 104 in response to execution of theprogramming instructions 804, to perform, e.g., but not limited to,various operations described for the logic circuitry 360, the logiccircuitry 470, the computer device 700 of FIG. 7, or operations shownand/or described with respect to technique 500 of FIG. 5. In alternateembodiments, programming instructions 804 may be disposed on multiplecomputer-readable storage media 802. In alternate embodiment, storagemedium 802 may be transitory, e.g., signals encoded with programminginstructions 804.

Referring back to FIG. 7, for an embodiment, at least one of processors702 may be packaged together with memory having all or portions ofcomputational logic 722 configured to practice aspects shown ordescribed for the system 100 shown in FIG. 1, transmitter 300 of FIG. 3,receiver 400 of FIG. 4, or operations shown or described with respect totechnique 500 of FIG. 5. For an embodiment, at least one of processors702 may be packaged together with memory having all or portions ofcomputational logic 722 configured to practice aspects described for thesystem 100 shown in FIG. 1, transmitter 300 of FIG. 3, receiver 400 ofFIG. 4, or operations shown or described with respect to technique 500of FIG. 5 to form a System in Package (SiP). For an embodiment, at leastone of processors 702 may be integrated on the same die with memoryhaving all or portions of computational logic 722 configured to practiceaspects described for the system 100 shown in FIG. 1, transmitter 300 ofFIG. 3, receiver 400 of FIG. 4, or operations shown or described withrespect to technique 500 of FIG. 5. For an embodiment, at least one ofprocessors 702 may be packaged together with memory having all orportions of computational logic 722 configured to practice aspects ofthe system 100 shown in FIG. 1, transmitter 300 of FIG. 3, receiver 400of FIG. 4, or operations shown or described with respect to technique500 of FIG. 5 to form a System on Chip (SoC).

Machine-readable media (including non-transitory machine-readable media,such as machine-readable storage media), methods, systems and devicesfor performing the above-described techniques are illustrative examplesof embodiments disclosed herein. Additionally, other devices in theabove-described interactions may be configured to perform variousdisclosed techniques.

EXAMPLES

Example 1 may include a full-duplex transceiver, which may comprise: atransmitter to transmit to a paired transceiver a channelized radiofrequency (RF) transmit signal via a dielectric waveguide, thechannelized RF transmit signal to include a plurality of modulated RFtransmit signals, each in a channel that has a frequency band that doesnot overlap with the frequency band of another of the modulated RFtransmit signals; a receiver to receive from the paired transceiver achannelized RF receive signal via the dielectric waveguide, thechannelized RF receive signal including a plurality of modulated RFreceive signals, each in a channel having a frequency band that does notoverlap with the frequency band of another of the modulated RF receivesignals; and circulator coupled between the transmitter, the receiver,and the dielectric waveguide to deliver the channelized RF transmitsignal from the transmitter to the dielectric waveguide and toconcurrently deliver the channelized RF receive signal from thedielectric waveguide to the receiver, and wherein the channelized RFreceive signal delivered from the circulator to the receiver of eachtransceiver includes an echo of the channelized RF transmit signal fromthe transceiver, and wherein the transceiver further includes an echosuppression circuit to suppress from the channelized RF receive signalthe echo of the channelized RF transmit signal of the transceiver,wherein the channelized RF transmit signal and the channelized RFreceive signal each has a frequency range from a lower frequency greaterthan or equal to approximately 30 gigahertz (GHz) to an upper frequencyless than approximately 1 terahertz (THz).

Example 2 may include the transceiver of example 1, and/or any otherexample herein, wherein the echo suppression circuit may be to receivethe channelized RF transmit signal from the transmitter to generate anecho suppression signal and the echo suppression circuit may be tosuppress the echo of the channelized RF transmit signal from thechannelized RF receive signal based on the echo suppression signal.

Example 3 may include the transceiver of example 2, and/or any otherexample herein, wherein the echo suppression signal may correspond tothe channelized RF transmit signal the circulator is to deliver to thedielectric waveguide concurrently when the circulator is to deliver thechannelized RF receive signal from the dielectric waveguide to thereceiver.

Example 4 may include the transceiver of example 2, and/or any otherexample herein, wherein the echo of the channelized RF transmit signalmay be received from the dielectric waveguide and includes a delaycorresponding to propagation of the channelized RF transmit signal alongthe dielectric waveguide and a chromatic dispersion imparted by thedielectric waveguide and wherein the transceiver further includes acalibration circuit to accommodate for the chromatic dispersion and tocooperate with the echo suppression circuit to suppress the echoreceived from the dielectric waveguide based on the echo suppressionsignal with accommodation for the chromatic dispersion.

Example 5 may include the transceiver of example 2, and/or any otherexample herein, wherein: the circulator may be to deliver thechannelized RF receive signal from the dielectric waveguide to thereceiver and the channelized RF transmit signal from the transmitter tothe dielectric waveguide concurrently; the echo suppression signal mayinclude a first echo suppression signal that corresponds to a first echoof the channelized RF transmit signal the circulator is to deliver tothe dielectric waveguide concurrently when the circulator is to deliverthe channelized RF receive signal from the dielectric waveguide to thereceiver; and the echo suppression signal may include a second echosuppression signal that corresponds to a second echo of the channelizedRF transmit signal received from the dielectric waveguide andcorresponds to the channelized RF transmit signal from a previous timewith a delay corresponding to propagation of the channelized RF transmitsignal from the previous time along the dielectric waveguide.

Example 6 may include the transceiver of example 5, and/or any otherexample herein, wherein the second echo may include a chromaticdispersion from the dielectric waveguide and the transceiver furtherincludes a calibration circuit to accommodate for the chromaticdispersion and to cooperate with the echo suppression circuit tosuppress the second echo based on the second echo suppression signalwith accommodation for the chromatic dispersion.

Example 7 may include the transceiver of example 2, and/or any otherexample herein, wherein the echo of the channelized RF transmit signalmay be received from the dielectric waveguide and includes a chromaticdispersion imparted by the dielectric waveguide and wherein thetransceiver further includes a calibration circuit to accommodate forthe chromatic dispersion and to cooperate with the echo suppressioncircuit to suppress the echo received from the dielectric waveguidebased on the echo suppression signal with accommodation for thechromatic dispersion.

Example 8 may include an apparatus, which may comprise: a transmitter totransmit a channelized radio frequency (RF) transmit signal via adielectric waveguide, wherein the transmitter may include: a pluralityof transmitter mixers, each of the plurality of transmitter mixers togenerate a modulated RF transmit signal based at least in part on a datasignal input and a local oscillator signal input specific to thetransmitter mixer, wherein each modulated RF transmit signal is in achannel having a frequency band that does not overlap with the frequencyband of another of the modulated RF transmit signals, and a combiner tocombine the modulated RF transmit signals from the plurality oftransmitter mixers as the channelized RF transmit signal fortransmission over the dielectric waveguide;

a receiver to receive a channelized RF receive signal via the dielectricwaveguide, the channelized RF receive signal including a plurality ofmodulated RF receive signals, wherein each of the modulated RF receivesignals is in a channel having a frequency band that does not overlapwith the frequency band of another of the modulated RF receive signals,the receiver including: a splitter to split the channelized RF receivesignal into the plurality of modulated RF receive signals; and aplurality of receiver mixers to receive respective ones of the pluralityof modulated RF receive signals from the splitter, each of the pluralityof receiver mixers to generate a data signal output based at least inpart on the respective RF receive signal and a local oscillator signalinput specific to the receiver mixer; anda circulator coupled between the transmitter, the receiver, and thedielectric waveguide to deliver the channelized RF transmit signal fromthe transmitter to the dielectric waveguide and to deliver thechannelized RF receive signal from the dielectric waveguide to thereceiver.

Example 9 may include the apparatus of example 8, and/or any otherexample herein, wherein the channelized RF receive signal delivered fromthe circulator to the receiver may include an echo of the channelized RFtransmit signal and wherein the apparatus may further include an echosuppression circuit to suppress from the channelized RF receive signalthe echo of the channelized RF transmit signal.

Example 10 may include the apparatus of example 9, and/or any otherexample herein, wherein the echo suppression circuit may be to receivethe channelized RF transmit signal from the transmitter to generate anecho suppression signal and the echo suppression circuit may be tosuppress the echo of the channelized RF transmit signal from thechannelized RF receive signal based on the echo suppression signal.

Example 11 may include the apparatus of example 10, and/or any otherexample herein, wherein the circulator may be to deliver the channelizedRF receive signal from the dielectric waveguide to the receiver and thechannelized RF transmit signal from the transmitter to the dielectricwaveguide concurrently, and wherein the echo suppression signal maycorrespond to the channelized RF transmit signal the circulator is todeliver to the dielectric waveguide concurrently when the circulator isto deliver the channelized RF receive signal from the dielectricwaveguide to the receiver.

Example 12 may include the apparatus of example 10, and/or any otherexample herein, wherein the echo of the channelized RF transmit signalmay be received from the dielectric waveguide and may include a delaycorresponding to propagation of the channelized RF transmit signal alongthe dielectric waveguide and a chromatic dispersion imparted by thedielectric waveguide and wherein the apparatus may further include acalibration circuit to accommodate for the chromatic dispersion and tocooperate with the echo suppression circuit to suppress the echoreceived from the dielectric waveguide based on the echo suppressionsignal with accommodation for the chromatic dispersion.

Example 13 may include the apparatus of example 10, and/or any otherexample herein, wherein: the circulator may be to deliver thechannelized RF receive signal from the dielectric waveguide to thereceiver and the channelized RF transmit signal from the transmitter tothe dielectric waveguide concurrently; the echo suppression signal mayinclude a first echo suppression signal that corresponds to a first echoof the channelized RF transmit signal the circulator is to deliver tothe dielectric waveguide concurrently when the circulator is to deliverthe channelized RF receive signal from the dielectric waveguide to thereceiver; and the echo suppression signal may include a second echosuppression signal that corresponds to a second echo of the channelizedRF transmit signal received from the dielectric waveguide andcorresponds to the channelized RF transmit signal from a previous timewith a delay corresponding to propagation of the channelized RF transmitsignal from the previous time along the dielectric waveguide.

Example 14 may include the apparatus of example 13, and/or any otherexample herein, wherein the second echo may include a chromaticdispersion from the dielectric waveguide and the apparatus furtherincludes a calibration circuit to accommodate for the chromaticdispersion and to cooperate with the echo suppression circuit tosuppress the second echo based on the second echo suppression signalwith accommodation for the chromatic dispersion.

Example 15 may include the apparatus of example 8, and/or any otherexample herein, wherein the transmitter and the receiver may providefull-duplex communication over the dielectric waveguide.

Example 16 may include the apparatus of example 8, and/or any otherexample herein, wherein the channelized RF transmit signal and thechannelized RF receive signal may each have a frequency range from alower frequency greater than or equal to approximately 30 gigahertz(GHz) to an upper frequency less than approximately 1 terahertz (THz).

Example 17 may include a system, which may comprise: first and secondtransceivers, wherein each of the first and second transceivers mayinclude: a transmitter to transmit to the other transceiver achannelized radio frequency (RF) transmit signal via a dielectricwaveguide, the channelized RF transmit signal including a plurality ofmodulated RF transmit signals, each in a channel having a frequency bandthat does not overlap with the frequency band of another of themodulated RF transmit signals; and a receiver to receive from the othertransceiver a channelized RF receive signal via the dielectricwaveguide, the channelized RF receive signal including a plurality ofmodulated RF receive signals, each in a channel having a frequency bandthat does not overlap with the frequency band of another of themodulated RF receive signals; a circulator coupled between thetransmitter, the receiver, and the dielectric waveguide to deliver thechannelized RF transmit signal from the transmitter to the dielectricwaveguide and to deliver the channelized RF receive signal from thedielectric waveguide to the receiver, and wherein the channelized RFreceive signal delivered from the circulator to the receiver of eachtransceiver includes an echo of the channelized RF transmit signal fromthe transceiver, and wherein the apparatus further includes an echosuppression circuit to suppress from the channelized RF receive signalthe echo of the channelized RF transmit signal of the transceiver.

Example 18 may include the system of example 17, and/or any otherexample herein, wherein the channelized RF transmit signal and thechannelized RF receive signal may each have a frequency range from alower frequency greater than or equal to approximately 30 gigahertz(GHz) to an upper frequency less than approximately 1 terahertz (THz).

Example 19 may include the system of example 18, and/or any otherexample herein, wherein the echo suppression circuit may be to receivethe channelized RF transmit signal from the transmitter as an echosuppression signal and the echo suppression circuit is to suppress theecho of the channelized RF transmit signal from the channelized RFreceive signal based on the echo suppression signal.

Example 20 may include the system of example 19, and/or any otherexample herein, wherein the circulator may be to deliver the channelizedRF receive signal from the dielectric waveguide to the receiver and thechannelized RF transmit signal from the transmitter to the dielectricwaveguide concurrently, and wherein the echo suppression signal maycorrespond to the channelized RF transmit signal the circulator is todeliver to the dielectric waveguide concurrently when the circulator isto deliver the channelized RF receive signal from the dielectricwaveguide to the receiver.

Example 21 may include the system of example 19, and/or any otherexample herein, wherein the echo of the channelized RF transmit signalmay be received from the dielectric waveguide and may include a delaycorresponding to propagation of the channelized RF transmit signal alongthe dielectric waveguide and a chromatic dispersion imparted by thedielectric waveguide and wherein the system further includes acalibration circuit to accommodate for the chromatic dispersion and tocooperate with the echo suppression circuit to suppress the echoreceived from the dielectric waveguide based on the echo suppressionsignal with accommodation for the chromatic dispersion.

Example 22 may include the system of example 19, and/or any otherexample herein, wherein: the circulator may be to deliver thechannelized RF receive signal from the dielectric waveguide to thereceiver and the channelized RF transmit signal from the transmitter tothe dielectric waveguide concurrently; the echo suppression signal mayinclude a first echo suppression signal that corresponds to a first echoof the channelized RF transmit signal the circulator is to deliver tothe dielectric waveguide concurrently when the circulator is to deliverthe channelized RF receive signal from the dielectric waveguide to thereceiver; and the echo suppression signal may include a second echosuppression signal that corresponds to a second echo of the channelizedRF transmit signal received from the dielectric waveguide andcorresponds to the channelized RF transmit signal from a previous timewith a delay corresponding to propagation of the channelized RF transmitsignal from the previous time along the dielectric waveguide.

Example 23 may include the system of example 22, and/or any otherexample herein, wherein the second echo may include a chromaticdispersion from the dielectric waveguide and the system further mayinclude a calibration circuit to accommodate for the chromaticdispersion and to cooperate with the echo suppression circuit tosuppress the second echo based on the second echo suppression signalwith accommodation for the chromatic dispersion.

Example 24 may include the system of example 17, and/or any otherexample herein, wherein the transmitter and the receiver providefull-duplex communication over the dielectric waveguide.

Example 25 may include an apparatus, which may comprise:

a transmitter to transmit a channelized radio frequency (RF) transmitsignal via a dielectric waveguide, wherein the transmitter may include:a plurality of transmitter mixers, each of the plurality of transmittermixers to generate a modulated RF transmit signal based at least in parton a data signal input and a local oscillator signal input specific tothe transmitter mixer, wherein each modulated RF transmit signal is in achannel having a frequency band that does not overlap with the frequencyband of another of the modulated RF transmit signals, and a combiner tocombine the modulated RF transmit signals from the plurality oftransmitter mixers as the channelized RF transmit signal fortransmission over the dielectric waveguide;

a receiver to receive a channelized RF receive signal via the dielectricwaveguide, the channelized RF receive signal including a plurality ofmodulated RF receive signals, wherein each of the modulated RF receivesignals is in a channel having a frequency band that does not overlapwith the frequency band of another of the modulated RF receive signals,wherein the receiver may include: a splitter to split the channelized RFreceive signal into the plurality of modulated RF receive signals; and aplurality of receiver mixers to receive respective ones of the pluralityof modulated RF receive signals from the splitter, each of the pluralityof receiver mixers to generate a data signal output based at least inpart on the respective RF receive signal and a local oscillator signalinput specific to the receiver mixer; and

a circulator coupled between the transmitter, the receiver, and thedielectric waveguide to deliver the channelized RF transmit signal fromthe transmitter to the dielectric waveguide and to deliver thechannelized RF receive signal from the dielectric waveguide to thereceiver.

Example 26 may include the apparatus of example 25, and/or any otherexample herein, wherein the channelized RF receive signal delivered fromthe circulator to the receiver may include an echo of the channelized RFtransmit signal and wherein the apparatus further includes an echosuppression circuit to suppress from the channelized RF receive signalthe echo of the channelized RF transmit signal.

Example 27 may include the apparatus of example 26, and/or any otherexample herein, wherein the echo suppression circuit may be to receivethe channelized RF transmit signal from the transmitter to generate anecho suppression signal and the echo suppression circuit may be tosuppress the echo of the channelized RF transmit signal from thechannelized RF receive signal based on the echo suppression signal.

Example 28 may include the apparatus of example 27, and/or any otherexample herein, wherein the circulator may be to deliver the channelizedRF receive signal from the dielectric waveguide to the receiver and thechannelized RF transmit signal from the transmitter to the dielectricwaveguide concurrently, and wherein the echo suppression signal maycorrespond to the channelized RF transmit signal the circulator is todeliver to the dielectric waveguide concurrently when the circulator isto deliver the channelized RF receive signal from the dielectricwaveguide to the receiver.

Example 29 may include the apparatus of example 27, and/or any otherexample herein, wherein the echo of the channelized RF transmit signalmay be received from the dielectric waveguide and includes a delaycorresponding to propagation of the channelized RF transmit signal alongthe dielectric waveguide and a chromatic dispersion imparted by thedielectric waveguide and wherein the apparatus may further include acalibration circuit to accommodate for the chromatic dispersion and tocooperate with the echo suppression circuit to suppress the echoreceived from the dielectric waveguide based on the echo suppressionsignal with accommodation for the chromatic dispersion.

Example 30 may include the apparatus of example 27, and/or any otherexample herein, wherein: the circulator may be to deliver thechannelized RF receive signal from the dielectric waveguide to thereceiver and the channelized RF transmit signal from the transmitter tothe dielectric waveguide concurrently; the echo suppression signal mayinclude a first echo suppression signal that corresponds to a first echoof the channelized RF transmit signal the circulator is to deliver tothe dielectric waveguide concurrently when the circulator is to deliverthe channelized RF receive signal from the dielectric waveguide to thereceiver; and the echo suppression signal may include a second echosuppression signal that corresponds to a second echo of the channelizedRF transmit signal received from the dielectric waveguide andcorresponds to the channelized RF transmit signal from a previous timewith a delay corresponding to propagation of the channelized RF transmitsignal from the previous time along the dielectric waveguide.

Example 31 may include the apparatus of example 30, and/or any otherexample herein, wherein the second echo may include a chromaticdispersion from the dielectric waveguide and the apparatus may furtherinclude a calibration circuit to accommodate for the chromaticdispersion and to cooperate with the echo suppression circuit tosuppress the second echo based on the second echo suppression signalwith accommodation for the chromatic dispersion.

Example 32 may include the apparatus of any of examples 25-31, and/orany other example herein, wherein the transmitter and the receiver mayprovide full-duplex communication over the dielectric waveguide.

Example 33 may include the apparatus of any of examples 25-31, and/orany other example herein, wherein the channelized RF transmit signal andthe channelized RF receive signal each may have a frequency range from alower frequency greater than or equal to approximately 30 gigahertz(GHz) to an upper frequency less than approximately 1 terahertz (THz).

Example 34 may include a system, which may comprise:

first and second transceivers, wherein each of the first and secondtransceivers may include: a transmitter to transmit to the othertransceiver a channelized radio frequency (RF) transmit signal via adielectric waveguide, the channelized RF transmit signal including aplurality of modulated RF transmit signals, each in a channel having afrequency band that does not overlap with the frequency band of anotherof the modulated RF transmit signals; and a receiver to receive from theother transceiver a channelized RF receive signal via the dielectricwaveguide, the channelized RF receive signal including a plurality ofmodulated RF receive signals, each in a channel having a frequency bandthat does not overlap with the frequency band of another of themodulated RF receive signals; a circulator coupled between thetransmitter, the receiver, and the dielectric waveguide to deliver thechannelized RF transmit signal from the transmitter to the dielectricwaveguide and to deliver the channelized RF receive signal from thedielectric waveguide to the receiver, and wherein the channelized RFreceive signal delivered from the circulator to the receiver of eachtransceiver includes an echo of the channelized RF transmit signal fromthe transceiver, and wherein the apparatus further includes an echosuppression circuit to suppress from the channelized RF receive signalthe echo of the channelized RF transmit signal of the transceiver.

Example 35 may include the system of example 34, and/or any otherexample herein, wherein the echo suppression circuit may be to receivethe channelized RF transmit signal from the transmitter as an echosuppression signal and the echo suppression circuit is to suppress theecho of the channelized RF transmit signal from the channelized RFreceive signal based on the echo suppression signal.

Example 36 may include the system of example 35, and/or any otherexample herein, wherein the circulator is to deliver the channelized RFreceive signal from the dielectric waveguide to the receiver and thechannelized RF transmit signal from the transmitter to the dielectricwaveguide concurrently, and wherein the echo suppression signal maycorrespond to the channelized RF transmit signal the circulator is todeliver to the dielectric waveguide concurrently when the circulator isto deliver the channelized RF receive signal from the dielectricwaveguide to the receiver.

Example 37 may include the system of example 35, and/or any otherexample herein, wherein the echo of the channelized RF transmit signalis received from the dielectric waveguide and may include a delaycorresponding to propagation of the channelized RF transmit signal alongthe dielectric waveguide and a chromatic dispersion imparted by thedielectric waveguide and wherein the system may further include acalibration circuit to accommodate for the chromatic dispersion and tocooperate with the echo suppression circuit to suppress the echoreceived from the dielectric waveguide based on the echo suppressionsignal with accommodation for the chromatic dispersion.

Example 38 may include the system of example 35, and/or any otherexample herein, wherein: the circulator may be to deliver thechannelized RF receive signal from the dielectric waveguide to thereceiver and the channelized RF transmit signal from the transmitter tothe dielectric waveguide concurrently; the echo suppression signal mayinclude a first echo suppression signal that may correspond to a firstecho of the channelized RF transmit signal the circulator is to deliverto the dielectric waveguide concurrently when the circulator is todeliver the channelized RF receive signal from the dielectric waveguideto the receiver; and the echo suppression signal may include a secondecho suppression signal that corresponds to a second echo of thechannelized RF transmit signal received from the dielectric waveguideand corresponds to the channelized RF transmit signal from a previoustime with a delay corresponding to propagation of the channelized RFtransmit signal from the previous time along the dielectric waveguide.

Example 39 may include the system of example 38, and/or any otherexample herein, wherein the second echo may include a chromaticdispersion from the dielectric waveguide and the system may furtherinclude a calibration circuit to accommodate for the chromaticdispersion and to cooperate with the echo suppression circuit tosuppress the second echo based on the second echo suppression signalwith accommodation for the chromatic dispersion.

Example 40 may include the system of any of examples 34-39, and/or anyother example herein, wherein the transmitter and the receiver mayprovide full-duplex communication over the dielectric waveguide.

Example 41 may include the system of any of examples 34-39, and/or anyother example herein, wherein the channelized RF transmit signal and thechannelized RF receive signal each has a frequency range from a lowerfrequency greater than or equal to approximately 30 gigahertz (GHz) toan upper frequency less than approximately 1 terahertz (THz).

Various embodiments may include any suitable combination of theabove-described embodiments including alternative (or) embodiments ofembodiments that are described in conjunctive form (and) above (e.g.,the “and” may be “and/or”). Furthermore, some embodiments may includeone or more articles of manufacture (e.g., non-transitorycomputer-readable media) having instructions, stored thereon, that whenexecuted result in actions of any of the above-described embodiments.Moreover, some embodiments may include apparatuses or systems having anysuitable means for carrying out the various operations of theabove-described embodiments.

The above description of illustrated implementations, including what isdescribed in the Abstract, is not intended to be exhaustive or to limitthe embodiments of the present disclosure to the precise formsdisclosed. While specific implementations and examples are describedherein for illustrative purposes, various equivalent modifications arepossible within the scope of the present disclosure, as those skilled inthe relevant art will recognize.

These modifications may be made to embodiments of the present disclosurein light of the above detailed description. The terms used in thefollowing claims should not be construed to limit various embodiments ofthe present disclosure to the specific implementations disclosed in thespecification and the claims. Rather, the scope is to be determinedentirely by the following claims, which are to be construed inaccordance with established doctrines of claim interpretation.

The invention claimed is:
 1. A full-duplex transceiver, comprising: atransmitter to transmit to a paired transceiver a channelized radiofrequency (RF) transmit signal via a dielectric waveguide, thechannelized RF transmit signal to include a plurality of modulated RFtransmit signals, each in a channel that has a frequency band that doesnot overlap with the frequency band of another of the modulated RFtransmit signals; and a receiver to receive from the paired transceivera channelized RF receive signal via the dielectric waveguide, thechannelized RF receive signal including a plurality of modulated RFreceive signals, each in a channel having a frequency band that does notoverlap with the frequency band of another of the modulated RF receivesignals; and a circulator coupled between the transmitter, the receiver,and the dielectric waveguide to deliver the channelized RF transmitsignal from the transmitter to the dielectric waveguide and toconcurrently deliver the channelized RF receive signal from thedielectric waveguide to the receiver, and wherein the channelized RFreceive signal delivered from the circulator to the receiver of eachtransceiver includes an echo of the channelized RF transmit signal fromthe transceiver, and wherein the transceiver further includes an echosuppression circuit to suppress from the channelized RF receive signalthe echo of the channelized RF transmit signal of the transceiver,wherein the channelized RF transmit signal and the channelized RFreceive signal each has a frequency range from a lower frequency greaterthan or equal to approximately 30 gigahertz (GHz) to an upper frequencyless than approximately 1 terahertz (THz).
 2. The transceiver of claim 1wherein the echo suppression circuit is to receive the channelized RFtransmit signal from the transmitter to generate an echo suppressionsignal and the echo suppression circuit is to suppress the echo of thechannelized RF transmit signal from the channelized RF receive signalbased on the echo suppression signal.
 3. The transceiver of claim 2wherein the echo suppression signal corresponds to the channelized RFtransmit signal the circulator is to deliver to the dielectric waveguideconcurrently when the circulator is to deliver the channelized RFreceive signal from the dielectric waveguide to the receiver.
 4. Thetransceiver of claim 2 wherein the echo of the channelized RF transmitsignal is received from the dielectric waveguide and includes a delaycorresponding to propagation of the channelized RF transmit signal alongthe dielectric waveguide and a chromatic dispersion imparted by thedielectric waveguide and wherein the transceiver further includes acalibration circuit to accommodate for the chromatic dispersion and tocooperate with the echo suppression circuit to suppress the echoreceived from the dielectric waveguide based on the echo suppressionsignal with accommodation for the chromatic dispersion.
 5. Thetransceiver of claim 2 wherein: the circulator is to deliver thechannelized RF receive signal from the dielectric waveguide to thereceiver and the channelized RF transmit signal from the transmitter tothe dielectric waveguide concurrently; the echo suppression signalincludes a first echo suppression signal that corresponds to a firstecho of the channelized RF transmit signal the circulator is to deliverto the dielectric waveguide concurrently when the circulator is todeliver the channelized RF receive signal from the dielectric waveguideto the receiver; and the echo suppression signal includes a second echosuppression signal that corresponds to a second echo of the channelizedRF transmit signal received from the dielectric waveguide andcorresponds to the channelized RF transmit signal from a previous timewith a delay corresponding to propagation of the channelized RF transmitsignal from the previous time along the dielectric waveguide.
 6. Thetransceiver of claim 5 wherein the second echo includes a chromaticdispersion from the dielectric waveguide and the transceiver furtherincludes a calibration circuit to accommodate for the chromaticdispersion and to cooperate with the echo suppression circuit tosuppress the second echo based on the second echo suppression signalwith accommodation for the chromatic dispersion.
 7. The transceiver ofclaim 2 wherein the echo of the channelized RF transmit signal isreceived from the dielectric waveguide and includes a chromaticdispersion imparted by the dielectric waveguide and wherein thetransceiver further includes a calibration circuit to accommodate forthe chromatic dispersion and to cooperate with the echo suppressioncircuit to suppress the echo received from the dielectric waveguidebased on the echo suppression signal with accommodation for thechromatic dispersion.
 8. An apparatus, comprising: a transmitter totransmit a channelized radio frequency (RF) transmit signal via adielectric waveguide, wherein the transmitter includes: a plurality oftransmitter mixers, each of the plurality of transmitter mixers togenerate a modulated RF transmit signal based at least in part on a datasignal input and a local oscillator signal input specific to thetransmitter mixer, wherein each modulated RF transmit signal is in achannel having a frequency band that does not overlap with the frequencyband of another of the modulated RF transmit signals, and a combiner tocombine the modulated RF transmit signals from the plurality oftransmitter mixers as the channelized RF transmit signal fortransmission over the dielectric waveguide; a receiver to receive achannelized RF receive signal via the dielectric waveguide, thechannelized RF receive signal including a plurality of modulated RFreceive signals, wherein each of the modulated RF receive signals is ina channel having a frequency band that does not overlap with thefrequency band of another of the modulated RF receive signals, whereinthe receiver includes: a splitter to split the channelized RF receivesignal into the plurality of modulated RF receive signals; and aplurality of receiver mixers to receive respective ones of the pluralityof modulated RF receive signals from the splitter, each of the pluralityof receiver mixers to generate a data signal output based at least inpart on the respective RF receive signal and a local oscillator signalinput specific to the receiver mixer; and a circulator coupled betweenthe transmitter, the receiver, and the dielectric waveguide to deliverthe channelized RF transmit signal from the transmitter to thedielectric waveguide and to deliver the channelized RF receive signalfrom the dielectric waveguide to the receiver.
 9. The apparatus of claim8 wherein the channelized RF receive signal delivered from thecirculator to the receiver includes an echo of the channelized RFtransmit signal and wherein the apparatus further includes an echosuppression circuit to suppress from the channelized RF receive signalthe echo of the channelized RF transmit signal.
 10. The apparatus ofclaim 9 wherein the echo suppression circuit is to receive thechannelized RF transmit signal from the transmitter to generate an echosuppression signal and the echo suppression circuit is to suppress theecho of the channelized RF transmit signal from the channelized RFreceive signal based on the echo suppression signal.
 11. The apparatusof claim 10 wherein the circulator is to deliver the channelized RFreceive signal from the dielectric waveguide to the receiver and thechannelized RF transmit signal from the transmitter to the dielectricwaveguide concurrently, and wherein the echo suppression signalcorresponds to the channelized RF transmit signal the circulator is todeliver to the dielectric waveguide concurrently when the circulator isto deliver the channelized RF receive signal from the dielectricwaveguide to the receiver.
 12. The apparatus of claim 10 wherein theecho of the channelized RF transmit signal is received from thedielectric waveguide and includes a delay corresponding to propagationof the channelized RF transmit signal along the dielectric waveguide anda chromatic dispersion imparted by the dielectric waveguide and whereinthe apparatus further includes a calibration circuit to accommodate forthe chromatic dispersion and to cooperate with the echo suppressioncircuit to suppress the echo received from the dielectric waveguidebased on the echo suppression signal with accommodation for thechromatic dispersion.
 13. The apparatus of claim 10 wherein: thecirculator is to deliver the channelized RF receive signal from thedielectric waveguide to the receiver and the channelized RF transmitsignal from the transmitter to the dielectric waveguide concurrently;the echo suppression signal includes a first echo suppression signalthat corresponds to a first echo of the channelized RF transmit signalthe circulator is to deliver to the dielectric waveguide concurrentlywhen the circulator is to deliver the channelized RF receive signal fromthe dielectric waveguide to the receiver; and the echo suppressionsignal includes a second echo suppression signal that corresponds to asecond echo of the channelized RF transmit signal received from thedielectric waveguide and corresponds to the channelized RF transmitsignal from a previous time with a delay corresponding to propagation ofthe channelized RF transmit signal from the previous time along thedielectric waveguide.
 14. The apparatus of claim 13 wherein the secondecho includes a chromatic dispersion from the dielectric waveguide andthe apparatus further includes a calibration circuit to accommodate forthe chromatic dispersion and to cooperate with the echo suppressioncircuit to suppress the second echo based on the second echo suppressionsignal with accommodation for the chromatic dispersion.
 15. Theapparatus of claim 8 wherein the transmitter and the receiver providefull-duplex communication over the dielectric waveguide.
 16. Theapparatus of claim 8 wherein the channelized RF transmit signal and thechannelized RF receive signal each has a frequency range from a lowerfrequency greater than or equal to approximately 30 gigahertz (GHz) toan upper frequency less than approximately 1 terahertz (THz).
 17. Asystem, comprising: first and second transceivers, wherein each of thefirst and second transceivers includes: a transmitter to transmit to theother transceiver a channelized radio frequency (RF) transmit signal viaa dielectric waveguide, the channelized RF transmit signal including aplurality of modulated RF transmit signals, each in a channel having afrequency band that does not overlap with the frequency band of anotherof the modulated RF transmit signals; a receiver to receive from theother transceiver a channelized RF receive signal via the dielectricwaveguide, the channelized RF receive signal including a plurality ofmodulated RF receive signals, each in a channel having a frequency bandthat does not overlap with the frequency band of another of themodulated RF receive signals; and a circulator coupled between thetransmitter, the receiver, and the dielectric waveguide to deliver thechannelized RF transmit signal from the transmitter to the dielectricwaveguide and to deliver the channelized RF receive signal from thedielectric waveguide to the receiver, and wherein the channelized RFreceive signal delivered from the circulator to the receiver of eachtransceiver includes an echo of the channelized RF transmit signal fromthe transceiver, and wherein the apparatus further includes an echosuppression circuit to suppress from the channelized RF receive signalthe echo of the channelized RF transmit signal of the transceiver. 18.The system of claim 17 wherein the channelized RF transmit signal andthe channelized RF receive signal each has a frequency range from alower frequency greater than or equal to approximately 30 gigahertz(GHz) to an upper frequency less than approximately 1 terahertz (THz).19. The system of claim 18 wherein the echo suppression circuit is toreceive the channelized RF transmit signal from the transmitter as anecho suppression signal and the echo suppression circuit is to suppressthe echo of the channelized RF transmit signal from the channelized RFreceive signal based on the echo suppression signal.
 20. The system ofclaim 19 wherein the circulator is to deliver the channelized RF receivesignal from the dielectric waveguide to the receiver and the channelizedRF transmit signal from the transmitter to the dielectric waveguideconcurrently, and wherein the echo suppression signal corresponds to thechannelized RF transmit signal the circulator is to deliver to thedielectric waveguide concurrently when the circulator is to deliver thechannelized RF receive signal from the dielectric waveguide to thereceiver.
 21. The system of claim 19 wherein the echo of the channelizedRF transmit signal is received from the dielectric waveguide andincludes a delay corresponding to propagation of the channelized RFtransmit signal along the dielectric waveguide and a chromaticdispersion imparted by the dielectric waveguide and wherein the systemfurther includes a calibration circuit to accommodate for the chromaticdispersion and to cooperate with the echo suppression circuit tosuppress the echo received from the dielectric waveguide based on theecho suppression signal with accommodation for the chromatic dispersion.22. The system of claim 19 wherein: the circulator is to deliver thechannelized RF receive signal from the dielectric waveguide to thereceiver and the channelized RF transmit signal from the transmitter tothe dielectric waveguide concurrently; the echo suppression signalincludes a first echo suppression signal that corresponds to a firstecho of the channelized RF transmit signal the circulator is to deliverto the dielectric waveguide concurrently when the circulator is todeliver the channelized RF receive signal from the dielectric waveguideto the receiver; and the echo suppression signal includes a second echosuppression signal that corresponds to a second echo of the channelizedRF transmit signal received from the dielectric waveguide andcorresponds to the channelized RF transmit signal from a previous timewith a delay corresponding to propagation of the channelized RF transmitsignal from the previous time along the dielectric waveguide.
 23. Thesystem of claim 22 wherein the second echo includes a chromaticdispersion from the dielectric waveguide and the system further includesa calibration circuit to accommodate for the chromatic dispersion and tocooperate with the echo suppression circuit to suppress the second echobased on the second echo suppression signal with accommodation for thechromatic dispersion.
 24. The system of claim 17 wherein the transmitterand the receiver provide full-duplex communication over the dielectricwaveguide.